EP3205443A1 - Procede de fabrication d'une roue dentee, roue dentee et compresseur - Google Patents

Procede de fabrication d'une roue dentee, roue dentee et compresseur Download PDF

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Publication number
EP3205443A1
EP3205443A1 EP16154842.5A EP16154842A EP3205443A1 EP 3205443 A1 EP3205443 A1 EP 3205443A1 EP 16154842 A EP16154842 A EP 16154842A EP 3205443 A1 EP3205443 A1 EP 3205443A1
Authority
EP
European Patent Office
Prior art keywords
gear
weight
cas
sections
carburizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16154842.5A
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German (de)
English (en)
Inventor
Ralf Bode
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP16154842.5A priority Critical patent/EP3205443A1/fr
Priority to PCT/EP2017/050632 priority patent/WO2017137209A1/fr
Publication of EP3205443A1 publication Critical patent/EP3205443A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/08—Surface hardening with flames
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • a gear compressor with such or comparable gear is already out of the WO 2015043879 A1 or the WO 2014195390 A1 or the WO 2012104153 A1 or the DE 10 2010 041 211 A1 known.
  • Gearboxes that transmit the power or output of turbomachinery usually have very high gear speeds in the pitch circle and small modules. Moreover, if the transmission is to realize high speed differences, then at least one component within the transmission, at least one so-called large gear, has a large number of relatively small teeth. Are these carburized carburized to improve the carrying capacity and case hardened, as in WO 2015044249 A2 described, then the thickness of the edge layer, which has an increased carbon content and thus the so-called Einhärteiefe caused by the small module are relatively small. In the production of such large wheels, the problem now arises that quenching in a liquid medium, such as oil or polymer solution or water caused by distortion dimensional and shape changes.
  • a liquid medium such as oil or polymer solution or water caused by distortion dimensional and shape changes.
  • so-called large wheels are often not case hardened, but made of tempered steels, but have significantly lower load capacities, manufactured and completely tempered. In practice, this leads to significantly greater tooth widths than would be required when using case hardening steels.
  • the higher material requirement is associated with greater costs, the gearboxes are more spacious and there are higher mechanical losses or this solution leads to a lower efficiency of the transmission.
  • the invention therefore has for its object to provide a method for producing a gear, a gear or a gear, which avoids the above-described disadvantages of the prior art.
  • the carburizing temperature is preferably between 850 ° C to 930 ° C.
  • the decisive advantage of the solution according to the invention is caused by the slower cooling of the gear in a gas atmosphere or cooling by means of the ambient air.
  • the gear is preferably simply stored in the air. This results in a slower cooling after carburizing unlike the commonly used liquid quench. Due to the slower cooling process, it does not come to the large distortions and deviations that require a mechanical reworking of the gear to such a great extent that the case-hardened edge zones are not sufficient as an allowance for post-processing.
  • the invention has recognized that the distortion problems arise to a barely controllable extent when the large gears are quenched from the austenitizing temperature in liquid, that is, in oil, a polymer solution or in water.
  • the austenitizing temperature is preferably between 750 ° C to 850 ° C.
  • the steel of the blank is a so-called air hardener.
  • the change of the gear material in connection with the new method causes the cooling in the ambient air gives the basic material of the blank or the gear particularly advantageous hardness properties, which can be achieved by cooling in air without the delays by quenching in liquid To have to buy.
  • the beyond hardening properties of the gear are required in particular in the field of teeth. These hardness properties are achieved in these carburized areas by a subsequent local tempering.
  • This surface hardening of the carburized sections is brought about by local heating and quenching, which does not lead to the geometric distortion problems of the prior art, since the surface hardening is performed only in relatively small areas in sections.
  • the Surface hardening is preferably carried out only on the toothing or on portions of the toothing.
  • step d) a step d1) such that after cooling and before step e) tempering at a temperature of 550 ° C to 650 ° C is performed.
  • This annealing improves positively the properties of the non-carburized area as needed.
  • An advantageous development of the invention provides that by means of carburizing the marginal carbon content of the gear in the carburized sections is between 0.7 wt .-% to 1.0 wt .-%.
  • the local heating is preferably carried out by flames or inductively or by means of a laser beam or by means of an electron beam. Quenching is particularly preferably carried out by means of a liquid, so that the cooling rate required for this type of hardening is ensured.
  • the further process envisages that tempering and mechanical finishing - as in the conventional method - take place.
  • finishing can also be carried out less expensively, because the lesser distortions can be taken into account in advance with a smaller dimensioned oversize, so that the volume to be machined is lower.
  • the gear according to the invention produced according to the invention thus consists of an air-hardening steel, which is case hardened in some areas.
  • the toothed wheel preferably has a carbon content of between 0.7% by weight and 1.0% by weight in the case-hardened partial regions. This carbon content has been obtained by means of the carburizing already described.
  • the case-hardened portions are located in the region of the toothing or comprise the toothing.
  • the preferred field of application of the invention is gears or gears with such gears, which have a diameter of at least 0.5m - preferably at least 0.7m - more preferably at least 1.0m. With such dimensions, the delays in the context of the conventional method for tempering the gear fall increasingly particularly significant.
  • FIG. 1 shows a flow chart of the method according to the invention for producing a gear PN.
  • step b) takes place a mechanical pre-processing with allowance of the gear PN and the blank GR instead.
  • step c) at least partial sections CAS of the gear PN are carburized, the entire gear PN being exposed to a carburizing temperature CAT, the carburizing sections CAS being enriched with carbon C.
  • the carburizing temperature (CAT) is between 850 ° C to 930 ° C.
  • the gear PN is deposited on air AIR, so that a relatively slow cooling of the air-hardening steel of the blank GR takes place.
  • the carburized subregions CAS remain largely relatively soft, the marginal carbon content (carbon C) after carburization being between 0.7% by weight and 1.0% by weight.
  • a step d1) may preferably be carried out as part of step d) such that, after cooling and before step e), tempering is carried out at a temperature of 550 ° C. to 650 ° C. This annealing improves positively the properties of the non-carburized area as needed.
  • step e) surface hardening of the carburized partial area CAS takes place.
  • the gearing - this is the carburized section CAS - heated to a suitable depth of material by a suitable method, for example by flame or inductive, to over the Austenitmaschinestemperatur there and rapidly quenched with a liquid (preferably oil, polymer or water).
  • the austenitizing temperature is preferably between 750 ° C to 850 ° C. The resulting distortions are only local and do not deform the gears PN as a whole.
  • step f) tempering takes place, so that the desired hardnesses and toughnesses in the base material and the surface hardened sections CAS are achieved.
  • step g the gear PN is mechanically finished, so that all nominal dimensions are produced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Articles (AREA)
EP16154842.5A 2016-02-09 2016-02-09 Procede de fabrication d'une roue dentee, roue dentee et compresseur Withdrawn EP3205443A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16154842.5A EP3205443A1 (fr) 2016-02-09 2016-02-09 Procede de fabrication d'une roue dentee, roue dentee et compresseur
PCT/EP2017/050632 WO2017137209A1 (fr) 2016-02-09 2017-01-13 Procédé de fabrication d'une roue dentée, roue dentée, compresseur à engrenage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16154842.5A EP3205443A1 (fr) 2016-02-09 2016-02-09 Procede de fabrication d'une roue dentee, roue dentee et compresseur

Publications (1)

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EP3205443A1 true EP3205443A1 (fr) 2017-08-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110527905A (zh) * 2019-08-28 2019-12-03 嘉诚(厦门)工业有限公司 一种餐具用金属材料及餐具生产工艺
CN113059318A (zh) * 2021-03-19 2021-07-02 西安煤矿机械有限公司 一种薄壁零件的制备方法
CN113084466A (zh) * 2021-03-08 2021-07-09 华南理工大学 一种三截面精度一致的斜齿轮的加工方法和一种斜齿轮
EP3878985A1 (fr) * 2020-03-09 2021-09-15 Areospace Trasmission Technologies GmbH Procédé et dispositif de fabrication de pièces traitées à la chaleur, en particulier de roues dentées à denture hélicoïdal
EP3878982A1 (fr) * 2020-03-09 2021-09-15 Areospace Trasmission Technologies GmbH Presse de durcissement, ainsi que procédé de fabrication de pièces traitées à la chaleur, en particulier de roues dentées à denture hélicoïdal

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110125623A (zh) * 2019-05-21 2019-08-16 台州格凌机械有限公司 一种齿轮的生产工艺
CN114905235A (zh) * 2022-04-19 2022-08-16 杭州正元齿轮制造有限公司 一种三联齿轮锻造成型工艺
CN115679242A (zh) * 2022-10-18 2023-02-03 河南柴油机重工有限责任公司 一种减小低碳合金钢齿轮变形的加工工艺

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929523A (en) * 1972-10-16 1975-12-30 Nippon Steel Corp Steel suitable for use as rolling elements
EP1051530A1 (fr) * 1998-01-28 2000-11-15 Northwestern University Aciers de cementation avancee et a trempe secondaire
WO2011099408A1 (fr) * 2010-02-15 2011-08-18 新日本製鐵株式会社 Procédé de production de tôles d'acier épaisses
DE102010041211A1 (de) 2010-09-22 2012-03-22 Siemens Aktiengesellschaft Turboverdichter
WO2012104153A1 (fr) 2011-02-02 2012-08-09 Siemens Aktiengesellschaft Joint de séparation étagé sur un carter de transmission d'une machine à fluide
WO2014195390A1 (fr) 2013-06-06 2014-12-11 Siemens Aktiengesellschaft Compresseur à engrenage
WO2015043879A1 (fr) 2013-09-25 2015-04-02 Siemens Aktiengesellschaft Compresseur à engrenage et procédé de montage
WO2015044249A2 (fr) 2013-09-26 2015-04-02 Siemens Aktiengesellschaft Procédé de fabrication de roue dentée
US20150101713A1 (en) * 2012-06-19 2015-04-16 Buffalo Armory Llc Method and apparatus for treating a steel article
JP2015113916A (ja) * 2013-12-11 2015-06-22 住友重機械工業株式会社 偏心揺動型の減速装置およびその偏心体軸歯車の製造方法
DE102014207431A1 (de) 2014-04-17 2015-10-22 Siemens Aktiengesellschaft Zahnrad mit Druckkamm und Fertigung

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929523A (en) * 1972-10-16 1975-12-30 Nippon Steel Corp Steel suitable for use as rolling elements
EP1051530A1 (fr) * 1998-01-28 2000-11-15 Northwestern University Aciers de cementation avancee et a trempe secondaire
WO2011099408A1 (fr) * 2010-02-15 2011-08-18 新日本製鐵株式会社 Procédé de production de tôles d'acier épaisses
DE102010041211A1 (de) 2010-09-22 2012-03-22 Siemens Aktiengesellschaft Turboverdichter
WO2012104153A1 (fr) 2011-02-02 2012-08-09 Siemens Aktiengesellschaft Joint de séparation étagé sur un carter de transmission d'une machine à fluide
US20150101713A1 (en) * 2012-06-19 2015-04-16 Buffalo Armory Llc Method and apparatus for treating a steel article
WO2014195390A1 (fr) 2013-06-06 2014-12-11 Siemens Aktiengesellschaft Compresseur à engrenage
WO2015043879A1 (fr) 2013-09-25 2015-04-02 Siemens Aktiengesellschaft Compresseur à engrenage et procédé de montage
WO2015044249A2 (fr) 2013-09-26 2015-04-02 Siemens Aktiengesellschaft Procédé de fabrication de roue dentée
JP2015113916A (ja) * 2013-12-11 2015-06-22 住友重機械工業株式会社 偏心揺動型の減速装置およびその偏心体軸歯車の製造方法
DE102014207431A1 (de) 2014-04-17 2015-10-22 Siemens Aktiengesellschaft Zahnrad mit Druckkamm und Fertigung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110527905A (zh) * 2019-08-28 2019-12-03 嘉诚(厦门)工业有限公司 一种餐具用金属材料及餐具生产工艺
EP3878985A1 (fr) * 2020-03-09 2021-09-15 Areospace Trasmission Technologies GmbH Procédé et dispositif de fabrication de pièces traitées à la chaleur, en particulier de roues dentées à denture hélicoïdal
EP3878982A1 (fr) * 2020-03-09 2021-09-15 Areospace Trasmission Technologies GmbH Presse de durcissement, ainsi que procédé de fabrication de pièces traitées à la chaleur, en particulier de roues dentées à denture hélicoïdal
CN113084466A (zh) * 2021-03-08 2021-07-09 华南理工大学 一种三截面精度一致的斜齿轮的加工方法和一种斜齿轮
CN113059318A (zh) * 2021-03-19 2021-07-02 西安煤矿机械有限公司 一种薄壁零件的制备方法

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WO2017137209A1 (fr) 2017-08-17

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